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Other non-operating income / (expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other non-operating income      
Derivative gains $ 785 $ 423 $ 21
Total other non-operating income: 785 423 21
Other non-operating expense      
Derivative losses   (7,587)  
Total other non-operating expense:   (7,587)  
Other non-operating income/(expense) - net 785 (7,164) 21
Gain (Loss) recorded due to changes in fair value of derivative liability (1,865) 8,501 $ 181
Recurring | Fair value hierarchy Level 3 | Hercules Loan Facility Warrant | Other nonoperating income (expense)      
Other non-operating expense      
Gain (Loss) recorded due to changes in fair value of derivative liability 300 0  
BMS      
Other non-operating income      
Derivative gains $ 500    
Other non-operating expense      
Derivative losses   $ (7,200)